19135421 has 8 divisors (see below), whose sum is σ = 20299320. Its totient is φ = 17975808.

The previous prime is 19135399. The next prime is 19135427. The reversal of 19135421 is 12453191.

It can be written as a sum of positive squares in 4 ways, for example, as 4351396 + 14784025 = 2086^2 + 3845^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19135421 - 2¹⁰ = 19134397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19135427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16385 + ... + 17513.

It is an arithmetic number, because the mean of its divisors is an integer number (2537415).

Almost surely, 2^19135421 is an apocalyptic number.

It is an amenable number.

19135421 is a deficient number, since it is larger than the sum of its proper divisors (1163899).

19135421 is a wasteful number, since it uses less digits than its factorization.

19135421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143.

The product of its digits is 1080, while the sum is 26.

The square root of 19135421 is about 4374.4052167123. The cubic root of 19135421 is about 267.4726253758.

The spelling of 19135421 in words is "nineteen million, one hundred thirty-five thousand, four hundred twenty-one".